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A. Top to bottom, atrial ECG, SAN and atrial OAPs show pause, exit block, and SAN reentrant arrhythmias after 300ms atrial pacing in the ex-vivo human heart; B. SAN 3D model, activation maps and histology sections of microreentry path; C. Macro-reentrant paths within the SAN-SACP-atria structure. (Modified from3,2).
